<template>
  <div id="app">
    <h3>案例：折叠面板</h3>
    <div>
      <div class="title">
        <h4>芙蓉楼送辛渐</h4>
        <span @click="isShow = !isShow" class="btn">
          {{ isShow ? "收起" : "展开" }}
        </span>
      </div>
      <div v-show="isShow" class="container">
        <p>寒雨连江夜入吴,</p>
        <p>平明送客楚山孤。</p>
        <p>洛阳亲友如相问，</p>
        <p>一片冰心在玉壶。</p>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isShow: true,
    };
  },
};
</script>

<style>
body {
  background-color: #ccc;
}

body #app {
  width: 400px;
  margin: 20px auto;
  background-color: #fff;
  border: 4px solid blueviolet;
  border-radius: 1em;
  box-shadow: 3px 3px 3px rgba(0, 0, 0, 0.5);
  padding: 1em 2em 2em;
}

body #app h3 {
  text-align: center;
}

body #app .title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid #ccc;
  padding: 0 1em;
}

body #app .title h4 {
  line-height: 2;
  margin: 0;
}

body #app .container {
  border: 1px solid #ccc;
  padding: 0 1em;
}

body #app .btn {
  /* 鼠标改成手的形状 */
  cursor: pointer;
}
</style>